LinkedIn, while not as “sexy” as Facebook, may be a far more useful tool for professionals. At least that’s the picture painted by LinkedIn’s latest infographic.

The headline numbers from the world’s number three social networking site are:

There are over 100 million registered LinkedIn members. That many business cards stacked up would be 98,425 feet high or about 3 times the height of Mount Everest. Of course they’d blow over in the wind, but that’s another story.

The second most represented industry represented on LinkedIn is finance. Real estate agents take note!